Chip breaker



March 31, 1931. w, D, JOHNSON ,798,206

CHIP BREAKER Filed DSC. 15, 1928 Patented Mar. 31, 1931 UNITED n STATES WALLACE D. JOHNSON, OF BELOIT, WISCONSIN,A ASSIGNOR-TOf-YATES-AMERICAN MA- CHINE COMPANY, OF BELOIT, WISCONSIN, A CORPORATION OF DELAWARE CHIP BREAKER Application med December 15, y1928.v serialr Naseegael; t

i." board reaches the cutter head and is drawn into the same before the chip breaker returns to force the board back against the opposite guide, with the result that the in-end of the board is cut unevenly or sniped.

The principal object of the invention is to provide an improved chip breaker which will prevent the in-end of the board from being sniped.

Another important object is to provide an improved chip breaker which will reduce to a minimum the pressure exerted by the same against the side of the board.

A further object is to provide an improved chip breaker which, when it is moved back by the boa-rd, does not change its position with respect to the board until after it has been moved back a certain distance.

Other objects and advantages of the invention will be evident to those skilled in the art upon a. full understanding of the construction, arrangement and operation of the improved chip breaker.

One form of the invention is presented herein for the purpose of exemplilication, but

Vit will of course be appreciated that the invention is susceptible of embodiment in other structurally modified forms coming equally within the scope of the appended claims.

In the accompanying drawing: Fig. 1 is a partiallyV sectioned plan View of a chip breaker constructed in accordance with the invention; and

Fig. 2 is a side view of the chip breaker. The chip breaker shown in the drawing is carried by the support 10 in which the cutter head (not shown) is mounted. -It includes a curved arm 11 which extends about one side of the cutter head and is shaped to form a hood for the same. The board to be cut approaches the chip breaker in the direction of the arrow 12 and engages with afshoe 13 which is carried by the arm 11. The arm 11y is pivoted at 14: to the support 10, and'bac'k'- ward swingingmovement of the free `end of ythe arm carrying the shoe 13 is resisted'by'a resiliently yieldable spring device 15 having a pivoted coupling member 16 `which *hooks about a. downwardly extending pin 17 4on thel arm and may be swung into or out of hooked position by a conveniently accessible handlel 18. Y i y y n v I .Y Y

The shoe'13 is pivotally attached at'longitudinally spaced points19 and 20 to a pair of parallel links 21 and 22 which are in turn pivotally attached at 23 and v24: to the'arm 11, and backward movement of the shoe wltn respect tothe arm is yieldingly kresisted by means of a coil spring 25. The coil spring encircles a guide rod 26 and iscompressed between a washer 27 on'the lrod whichy bears against the rear end of the shoe and another washer 28 Ion the rod which bears against a4 mrlala'll,V OFFICE threaded sleeve 29`screwedinto` a threaded aperture 30 inthe arm. 'The pressure of theV coil spring on the shoe'occurs; in line with the direction of movement ofthe shoe. i e f l.

They shoe k13 is much lighter than the arm 11 and the spring 25 ofers'considerably less resistance than the spring device 15, with'the result that, when the shoe is struck and pushed back by the in-end of the board,it v

moves independently of the arm andA does not commence to change its position with'respect tothe edge of the board until afterits back-v ward movement has continued to such an eX- tent as to necessitate some movement off the arm,vafter which the shoe of course swings with the'arm about the pivotal" axis of the latter, as in an ordinary chip breaker. i

The chip breaker ofthe invention possesses many advantages over the ordinary chip breaker. Not only does it effectively prevent l sniping, but it is eitremely. quick in its action,

doesnot bound, dance'orvchatter, produces aV good edge on the stock, and does. not tend to wedge against the stock or be drawn in and moved along by the same. While the chip breaker shown in the drawing is designed particularlyfor use with a side head, it may also be used in association with a top head, and may, if desired, be of sectional construction.

I claim:

1. In a chip breaker, the combination with a cutter head, and a support for the same,

of a hood for the cutter head pivotally atf tached to the support at one side of the cutter head, resiliently yieldable means for resisting movement of the hood about the pivotal axis thereof, a shoecarred by the hood'at the opposite side of the cutter head from the pivotal axis of the hood, parallel links pivotally connected to the shoe and to the of movement of such link for resisting movement of the shoe relative to the arm.

In witness whereof I have hereunto subscribed my name.

WALLACE. D. JOHNSON.

hood for allowing the shoe to shift bodily f able means forresisting movement of the arm about the pivotal axis thereof, a shoe carried bythe arm at theopposite side of the cutter head` from the lpivotal axis of the arm, parallel links pivotal'ly connected to the shoe and .tothe armefor allowing the shoe to shiftY bodily with respect to the arm, and resiliently yieldable means for resisting movement of `theshoe relativeto thearm. l

3. In a chipbreaker, thecoinbi-nationwith a cutter head, and a support for the same, of an arm pivotally attached tothe support at one side of the cutter head, resiliently yieldable inea-ns forresisting movementof the armV about the pivotal axis thereof, a shoe carried by the :arm.atSthe-oppositeiside of the. cutter head from the pivotal aaisofthe arm, parallel links pivotally connected to theshoe and to the armLV forallowing the shoe to shift bodily with respect y.tothe arm,land resiliently yieldablemeans for resistingmovement of thel shoe relative to the arm, the pivotal eon.-`

nections betweentheshoe and the link being closer to the pivotal axis of the arm than the pivotalconnections between the arm andthe. links. .l .K 4. In a chip breaker, thecombi-nation with a .cutter head, and a .support-for the. same,

of en arm for the cutter head ,pivotallyat?y tached to the support at ,one side ofthe cutterl head, a spring for resstngmovement of the arm about'the pivotal axis thereof, an elongated shoe ca rried by the arm and provided witha work-engagin plate atthe opposite side ofthe cutter head of thearm, parallel links pivotally connected to theshoean'd 'to the arm for allowing the.

shoe to shift-v -bodily with respect to fthearm,

and? a vspring operating against kthe shoe at the poi-nt of connection/of one ofthe links Vin a direction substantially tangentialV to thearc from the pivotal axis 

